华北板块北缘早古生代造山带的稳定盖层——西别河组是顶底清晰,下界不整合覆于早—中奥陶世岛弧建造之上,其上被下泥盆统查干哈布组、上石炭统阿木山组不整合覆盖的一套稳定的滨浅海相沉积建造。本次工作根据岩石地层特征划分了砂砾岩段、灰岩段、砂板岩段和巴特敖包礁4个填图单元;在生物地层工作的基础上分别划分了2个珊瑚、腕足化石组合带,确立了该组为中—晚志留世地层,即Wenlockian-Pridolian期的沉积。 The Upper Paleozoic orogenic belt, the stable caprock of the Early Paleozoic orogenic belt in the northern margin of the North China Plate, is clear top-bottom with unconformity overlying the Early-Middle Ordovician island arc. Cloth group, the Amunshan Formation of the Carboniferous Formation unconsolidated and covered by a set of stable coastal shallow marine sedimentary deposits. According to the characteristics of rock stratum, this work divides four mapping units of glutenite, limestone, sandstone and Butte Aoeo reef. Based on the work of biostratigraphy, it divides two assemblages of corals, brachiopods and fossils, This group was established as a mid-late Silurian formation, the Wenlockian-Pridolian deposition.